Construction of reciprocating beds for cylinder printing-presses.



M. ROGKSTOH. Y OONSTRUGTION 0I' BEOIPBOGATING BEDS FOB CYLINDER PRINTING PRESSES.

APPLICATION FILED 110V.l 14, 1906. 935,*550. Patented Spt.r28,19l09.

Figi. u

MAX ROCKSTROH, OF KLEIN-SEDLITZ, NEAR PIRNA, GERMANY.

CONSTRUCTION OF RECIPROCTING BEDS FOR CYLINDER PRINTING-PRESSES.

Specification of Letters Patent.

Application led November 14, 1906. Serial No. 343,430.

To all 'wltom tt may concern:

Ylle it known that I. MAX llocus'rnou. director. citizen ot' the Kingdom ot' Saxony, residing at Klein-Scdlitz. near Pirna. Saxony, (lei-many` have invented certain new and useful lmpro\.ements in the Construction ot `Reciprocaling leds tor Cylinder lriutinglfresses, ot' which the t'ollowing isa specitication.

vThe means heretoforey employed in cylinder pril'iting presses t'or insuring` the producs tion ot a clear impression have consisted in so constructing and arranging the'bed by a great body and proper disposition ot' metal and substantial stitt'ei'iing pieces as to pre vent as tar as possible the wal-pum` Vot the reciprocating printing surface or form durwith the center ot' gravity ot the printing toria or lie in the same plane therewith. ln-

consequence, however, ot' the energy impari. ed to the moving masses, ot' the moments ot' inertia ot' these masses,'in a press constructed in the manner heretofore usual. there are liable to occur at. each accela'ation or re tardation of the motion otl the printing t'orm and especially at each reversal ot' the direction ot its motion, moments ot inertia that tend to tiltl the printing torni to one lside or to litt it ott' its guides, and consequently iniuriously to atl'ect thc quality of the impression. Now tor the purpose ot overcoming the detects about referred to, the point or points at which the power acts is arranged either accurately in the plane through the center ot gravity ot the printing plate or at all events as closely coincident with this plane as is consistent with the constructional requirements before, referred to.

rlhe accompanying` drawings illustrate various examples ot a printing` press in ac coi-dance with this invention, the carriage ot which is directly driven in the usual manner b v means of a motor actuated by compressed air` water under pressure, or other suitable source ot power.

l `igure l isa longitudinal section and Fig. 3 a rear elevation of a press wherein the pistou rod of the motor is attachml to the bed which carries the printing` torni I while the, motor a. itself is rigidly connected with the bedplate (l. "The bed is recesed in the direction of the axis ot' the motor hv which means the pointof attachment of the piston rod which passes through the bed is as nearly as .possible caused to coincide with the center.

ot gravity of the bed. By the foregoing arrangement, the ,operative connection, 'a'. c., piston rod l) is situated betweeen the two points of resistance. one of said points being the upper surface of the torni and the other of the said points being the. bearing plane ot' the bed which carries the torni.

Fig. 3 shows in end elevation a modified construction ot` printing press wherein instead ot' a single motor centrally arranged there are, provided two motors, one on each side ot the printing` plate. ln this instance also the piston rod is connected with the printing plate and the motor with the bedplate.

Figs. 4 and illust-rate a third modilicat-ion ot printing press wherein the motor is connected with the printing` plate, while the piston rod is rigidly connected with the frame of the press. The printing` plate, which is perforated in the plane of the center ot' gravityfreceives the motor cylinder' a together with which it forms a rigid struet-ure. Instead of a single motor axially arranged in relation to the printing plate., there may be employed a pair ot motors, arranged one oncach side of the printingplate, in the manner shown in Fig. 3.

Having thus declared the nature of my said invention and in what manner it is to.be performed I declare that, whatI l claim is2- ln a cylinder printing press, the combina tion with a bed plate and a recessed carriage which travels over the bed plate, ot a motor including a cylinder' and a piston constituting cooperating parts, one ot which Patented Sept. 28, *t9-Gela mounted on the bed piate in a plane above my hand in presence of two subscribing Wit# its traction or bearing plane and the other nesses.

of which is disposed in the recess of `the carf 4 rage and is connected thereto t a point Sub- MAX ROCKSTROH' stantially coincident with the center of grav- Witnesses: I

ULYs'sE's J. BYWATER.

ity of he carriage.

In testimony whereof I have hereunto set PAUL ARRAS. 

